A dedicated sample of Large Hadron Collider proton-proton collision data at centre-of-mass energy s = √8 TeV is used to study inclusive single diffractive dissociation, pp → X p. The intact final-state proton is reconstructed in the ATLAS ALFA forward spectrometer, while charged particles from the dissociated system X are measured in the central detector components. The fiducial range of the measurement is −4.0 < log 10ξ < −1.6 and 0.016 < |t| < 0.43 GeV 2, where ξ is the proton fractional energy loss and t is the squared four-momentum transfer. The total cross section integrated across the fiducial range is 1.59 ± 0.13 mb. Cross sections are also measured differentially as functions of ξ, t, and ∆η, a variable that characterises the rapidity gap separating the proton and the system X. The data are consistent with an exponential t dependence, dσ/dt ∝ e Bt with slope parameter B = 7.65 ± 0.34 GeV −2. Interpreted in the framework of triple Regge phenomenology, the ξ dependence leads to a pomeron intercept of α(0) = 1.07 ± 0.09.
|Number of pages||37|
|Publication status||Published - 6 Feb 2020|
Bibliographical note34 pages in total, author list starting page 18, 5 figures, 1 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-01
- Hadron-Hadron scattering (experiments)
- Forward physics
ASJC Scopus subject areas
- Nuclear and High Energy Physics